BERLIN (AP) — A key potential ally in Germany's next government insisted Tuesday that Chancellor Angela Merkel's party shouldn't keep the finance ministry because that gives her too much power. Exploratory talks on a potential coalition of Merkel's conservatives, the pro-business Free Democrats and traditionally left-leaning Greens start on Wednesday. Merkel's current partners, the center-left Social Democrats, vowed to go into opposition after last month's election. Outgoing Finance Minister Wolfgang Schaeuble, a member of Merkel's Christian Democratic Union, has been a powerful figure for the past eight years in domestic politics and in the eurozone's efforts to overcome the debt crisis that started in Greece.